Monoazo dye.



I unwrap STATES PATENT OFFICE.

ARTHUR, ZABT, OF VOHWINKEL, NEAR ELIBERFELD, AND KURT DESAMARI, OFELBERFELD, 4 GERMANY, ASSIGNORS TO FARBENFABRIKEN VOIRM. FRIEDR. BAYER &60., OF ELBERFELD, GERMANY, A CORPORATION OF GERMANY.

MONOAZO DYE.

ans-anon Patented Apr. 8, 1913.

Noibrawlng. Original application filed July'27, 1911, 86218.1 No.640,781. Divided and this application filed July 1 6, 1912. Serial110.709,?23. e

To all it may concern Be it lmown that we, ARTHUR ZART and KURTDESAMARI, doctors of philosophy, chemists, citizens of the GermanEmpire, residing, respectively, at Vohwinkel, near Elberfeld, andElberfeld, Germany, have invented new and useful Improvements inMonoazo' Dye,

of which the following is a specification.

R meaning a derivative of the 2-amino-5-v naphthol-7 sulfonic acidcontaining a heteronuclear ring:

The new dyes are obtained by combining the diazo compounds prepared fromaminophenyl-5-oxy-2 haphthimidazole-7 sulfoni'c with the symmetricalurea obtained fromv Q-amino-waphthol-j-sulfonic 'acid;

The present application which is a divisional application from ourapplication Serial No. 640,7 81, filed July 27,1911 concerns themanufacture and production of new azo coloring matters having mostprobably the following general formula:

I \g-N-en-n aminophenyl 5 oxy -2-naphthoxazole-7-sulfonic acids 40aminopheriyl 5 oxy naphthothiazole-7-sulfonie acids L 3 v aim The newdyes having most probably the formula:

SO3H\/\/\/NHCONH\/ l ll K/\/ (X NH which may be replaced by O and S) arafter being dried and pulverized 111 the shape of their alkaline saltsdark powders soluble in water; yielding upon reduction with stannouschlorid and hydro ehloric acid a derivative of 2-amino-5-naptlnthol-7sulf0n1c acid containing a heteronuclear ring:

7) son N cwH/ C05H4-NH2 5 on X and a compound of the formula: so3r1/NHCO-NH\/ so;a

dyeing cotton from red to bluish-red shades l l N which on beingdeveloped with diazotized para-nitranilin change into shades fast towashing and capable of being discharged to a pure white.

The following example may further illus trate the invention, the partsbeing by weight :357 parts (1 mol.) ofpara-aminophenyl-S-oxy-1.2-naphthimidazoleJ-sulfonic acid are diazotizedwith parts of sodium shade after being developed with diazotizedpara-nitranilin is blue-red fast to washing.

tcan be discharged to a pure white.

Meta-aminophcnyl derivatives of the above mentioned hctermiuclcarcompounds of 2.5.7-an1inonaphthol sul'lonic acids can be used.

We claim 1. As new products the m'onoazo-dyestufi's having most probablythe formula:

(X meaning a divalent radical in the azole l and hydrochloric acid aderivative of 2- nucleus) which are after being dried and lam1no-5-naphthol-7-sulfonic acid containpulverized in the shape of theiralkaline salts dark powders soluble in Water; yielding upon reductionwith stannous chlorid ing a heteronuclcar ring and a compound of theformula:

l -NHa 70 dyeing cotton from red to bluish-red shades I which on beingdeveloped with diazotized to a pure white,

2. As a new product the dye having most probably the formula I 5asymmetrical urea of 2.5.7-aminonaphthol l5 sulfonic acid and2.6-diamino-5-naphthol 7- sulfonic acid; dyeing cotton red, which shadeafter being developed with diazotized AH K12 para-nitranilin is blue-redfast to Washing which can be discharged to a pure white, substantiallyas described.

In testimony whereof We have hereunto set our hands in the presence oftwo subscribing Witnesses.

ARTHUR ZART. L. s.

KURT DESAMARI. [L.s.] WVit-nesses:

HELEN NUFER, VALBEIIT NUFER.

Copies of this patent may be obtained for five cents each, by addressingthe Commissioner of l'atentl,

Washington, D. G.

